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| Value | Description | Notes | Issue |
|---|---|---|---|
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| 01 | Proprietary | For example, publisher’s own series ID | 0 |
| 02 | ISSN | International Standard Serial Number, unhyphenated, 8 digits | 0 |
| 03 | German National Bibliography series ID | Maintained by the Deutsche Bibliothek | 0 |
| 04 | German Books in Print series ID | Maintained by VLB | 1 |
| 05 | Electre series ID | Maintained by Electre Information, France | 1 |
| 06 | DOI | Digital Object Identifier (variable length and character set) | 6 |
| 22 | URN | Uniform Resource Name | 8 |